Global Period in Medical Billing: 7 Essential Rules

The global period in medical billing is a set period when certain services related to a surgical procedure are included in the payment for that procedure. In simple terms, the payer does not separately reimburse every routine follow-up visit after surgery.

For Medicare, common global periods are 0, 10, and 90 days. The correct period depends on the procedure’s global surgery indicator in the Medicare Physician Fee Schedule. CMS guidance explains that 10-day procedures include the procedure day plus 10 postoperative days, while 90-day procedures include one day before surgery, the surgery day, and 90 days afterward.

This matters because incorrectly billing a routine postoperative visit can result in a denial, while failing to bill a separately payable service can leave legitimate revenue uncollected. In this guide, we will cover how global periods work, when you can bill separately, which modifiers matter, common mistakes, and practical ways to prevent claim problems.

What Is a Global Period in Medical Billing?

A global period is the time surrounding certain surgical procedures during which Medicare considers specific related services part of the surgical payment.

The idea is straightforward: instead of paying separately for every routine service connected with surgery, Medicare bundles certain services into the procedure’s reimbursement.

However, not every service provided during the global period is automatically included. Unrelated services and certain qualifying services may be separately reportable when the applicable requirements are met.

That distinction is important for both coding accuracy and revenue cycle management.

What Are the 0, 10, and 90-Day Global Periods?

Medicare assigns surgical procedures different global indicators. The most common ones are 0, 10, and 90. CMS also uses other indicators, including YYY, XXX, ZZZ, and MMM, depending on the service.

0-Day Global Period

A 0-day global procedure does not have postoperative days after the procedure.

However, that does not mean every E/M service performed on the procedure date is automatically payable. Medicare applies specific same-day rules.

10-Day Global Period

A 10-day global procedure includes the procedure date and the following 10 days.

Therefore, CMS describes the total period as 11 calendar days when the procedure day is included in the count.

90-Day Global Period

A 90-day procedure generally includes:

• • One day before surgery

• • The surgery date

• • 90 postoperative days

That creates a total period of 92 days.

How to Check a Procedure’s Global Period

Do not guess the global period from the procedure description.

For Medicare, use the Medicare Physician Fee Schedule Look-Up Tool and review the global indicator for the specific procedure code. CMS identifies the PFS tool as the source for determining the applicable global surgery period.

A Simple Verification Process

Step 1: Identify the procedure code

Find the CPT or HCPCS code billed for the surgery.

Step 2: Check the global indicator

Confirm whether the procedure has a 0, 10, 90, YYY, or another applicable indicator.

Step 3: Calculate the dates

Use the procedure date to determine when the global period begins and ends.

Step 4: Review the follow-up service

Determine why the patient returned.

Was it routine postoperative care? An unrelated problem? A complication? Or another separately identifiable service?

Step 5: Review the documentation

Make sure the medical record supports the reason for the encounter and any modifier used.

This simple process can prevent many avoidable global surgery denials.

What Services Are Included in the Global Package?

The global surgical package can include services related to the surgery, including applicable postoperative care.

The key question is not simply, “Is the patient within the global period?”

The better question is:

“What service was performed, and why was it performed?”

Can You Bill an E/M Visit During a Global Period?

An E/M service, or evaluation and management service, is a visit where the provider evaluates and manages a patient’s condition.

A common mistake is billing an E/M code for every postoperative visit.

Routine postoperative care is generally included when it falls within the applicable global package. But an unrelated or separately identifiable service may qualify for separate reporting when Medicare’s requirements are met.

For example, suppose a patient returns after surgery for a routine wound check. That visit would generally be part of the global package.

Now suppose the same patient returns during the global period because of an unrelated medical condition that requires a separately identifiable evaluation. That situation may support separate E/M reporting when the documentation and applicable modifier requirements are satisfied.

Important Modifiers for Global Period Billing

Modifiers provide additional information about why a service is being reported. They should never be added simply to force payment.

For example, CMS recognizes modifiers 54, 55, and 56 for applicable transfer-of-care situations. CMS also provides specific rules regarding how surgical and postoperative claims should be reported.

The documentation must support the modifier. A modifier alone does not make an otherwise non-payable service payable.

Global Period Billing Example

A surgeon performs a procedure with a 90-day global period on June 1.

The patient returns on June 20 for a routine postoperative examination.

Because the visit falls within the global period and is routine postoperative care, it is generally included in the surgical payment.

Now consider a different situation.

The patient returns on June 20 because of an unrelated condition requiring a separately identifiable evaluation.

The billing team should review the documentation and applicable Medicare rules to determine whether the E/M service can be reported separately.

This example shows why the reason for the encounter matters just as much as the date.

What About Surgical Complications?

Do not assume every postoperative problem is separately billable.

CMS’s 2026 NCCI guidance explains that treatment of a postoperative complication generally is not separately reportable when it does not require a return to the operating room. Certain circumstances, such as an unplanned return to the operating room, can support different reporting rules and may involve modifier 78.

Before billing separately, review:

• • What happened?

• • Was it expected postoperative care?

• • Was a true complication documented?

• • What treatment was provided?

• • Did the patient return to the operating room?

• • Does the payer allow separate reporting?

• • Does the medical record support the claim?

Documentation Requirements

Good documentation is critical when billing a service during a global period.

If an unrelated E/M service is billed, the documentation should clearly demonstrate why the service was separate from routine postoperative care.

Common Global Period Billing Mistakes

Billing Every Postoperative Visit

Routine postoperative care is generally included in the global package. Billing every follow-up separately can trigger claim edits and denials.

Using Modifier 24 Without Support

Modifier 24 should not be used simply because an E/M service occurred during a global period. The encounter must qualify as unrelated under the applicable rules.

Assuming Every Surgery Has a 90-Day Global

This is incorrect. Medicare procedures can have different global indicators. Always verify the specific code.

Using Outdated Billing Rules

Global surgery policies can change. CMS continues to evaluate the accuracy of global surgical payment and postoperative care. For CY 2026, CMS specifically solicited comments on improving global surgery payment accuracy.

Ignoring Payer Differences

Medicare rules should not automatically be applied to every commercial payer. Always check the payer’s current policy and contract requirements.

Global Period Denial Prevention Checklist

Before submitting a claim, ask:

This process is especially useful for surgical practices with high volumes of postoperative claims.

Why Global Period Rules Matter to Revenue

Global-period errors affect revenue in two ways.

First, overbilling can create unnecessary denials, rework, refunds, and compliance concerns.

Second, underbilling can happen when staff assume that every service provided during a global period is included.

The goal is not to submit more claims. The goal is to submit accurate claims supported by documentation and payer rules.

For billing teams, a global-period edit built into the claim-scrubbing process can catch many problems before the claim reaches the payer.

Conclusion

The global period in medical billing is important for accurate surgical claims, clean revenue cycle management, and denial prevention. Medicare commonly uses 0-, 10-, and 90-day global periods, but the correct rule depends on the specific procedure and its current global indicator.

The safest approach is simple: verify the procedure code, check the current global period, calculate the dates correctly, understand why the patient was seen, review the documentation, and use modifiers only when supported.

For medical practices and billing companies, this workflow can reduce avoidable denials while helping staff avoid both overbilling and missed revenue.

Frequently Asked Questions